Histograms of the measures related to streamlines. Values of number of streamlines (a), mean length of streamlines (b) and volume (c) from all tracts. * p < .05; ** p < .01. ASDs: Autism Spectrum Disorders. CC: corpus callosum; Cing: cingulum; DAF: direct segment of the arcuate fasciculus; IAAF: indirect anterior segment of the arcuate fasciculus; IPAF: indirect posterior segment of the arcuate fasciculus. Units of length are mm and units of volume are mm3.